When a ray of light of frequency 6 × 10¹⁴ Hz travels from water of refractive index 4/3 to glass of refractive index 8/5, its:
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Question

When a ray of light of frequency 6 × 10¹⁴ Hz travels from water of refractive index 4/3 to glass of refractive index 8/5, its:

G1 Physics · Accepted Answer

Derived solution: Step 1: Use Snell’s law at each plane interface. For paraxial viewing through a plane surface, apparent depth = real depth × n(observer)/n(object medium). Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is speed decreases to 5/6 of its initial value. Therefore the correct option is B.